package com.yehuishou.weixin_pay;

import java.net.InetAddress;
import java.net.UnknownHostException;

import javax.servlet.http.HttpServletRequest;

public class IpAddressGet {

	public static  String getIpAddr(HttpServletRequest request){    
        String ipAddress = request.getHeader("x-forwarded-for");    
            if(ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {    
                ipAddress = request.getHeader("Proxy-Client-IP");    
            }    
            if(ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {    
                ipAddress = request.getHeader("WL-Proxy-Client-IP");    
            }    
            if(ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {    
                ipAddress = request.getRemoteAddr();    
                if(ipAddress.equals("127.0.0.1") || ipAddress.equals("0:0:0:0:0:0:0:1")){    
                    //根据网卡取本机配置的IP    
                    InetAddress inet=null;    
                    try {    
                        inet = InetAddress.getLocalHost();    
                    } catch (UnknownHostException e) {    
                        e.printStackTrace();    
                    }    
                    ipAddress= inet.getHostAddress();    
                }    
            }    
            //对于通过多个代理的情况，第一个IP为客户端真实IP,多个IP按照','分割    
            if(ipAddress!=null && ipAddress.length()>15){ //"***.***.***.***".length() = 15    
                if(ipAddress.indexOf(",")>0){    
                    ipAddress = ipAddress.substring(0,ipAddress.indexOf(","));    
                }    
            }    
            return ipAddress;     
    } 
	
}
